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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c62369e84f6bc95da58d5557545d6d6c53c98375b393975c36b8efc28e08b82a' 
  AND token = 'ZA5lznGRcjyC4yZOa634tkVauttQ2J6u2LA5ixCNq9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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