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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad8d7ba6fc12664b535eaa264b426339f6ef419aeb9f219a992ea512cf099bb4' 
  AND token = 'J7kOCGJYd0dEc+lz2SCR+XfuUCkf+nWwVMP0+WS8Y5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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