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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e540285e61dc0b79599bdaae27d52a67b97500976868d1b5b2d1bfe3dc863cb' 
  AND token = 'MmXG62KMyh5sEvmslxkGiF954aRsKjdTQ4FdBAMtG6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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