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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea8855e574a25c2894df571b7ac33c2abd15861047c1d63ba35a073f153d7054' 
  AND token = 'AvJ06xV/rcAYlTOP3QPzuW105Tr9kyb58KhF1vt2WDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}