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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1659311bc6f96bbb3780ca03b8529694a3a413d997e0b3fdbadd7a72f3640340' 
  AND token = 'xMIlhXjCTTTg6WIS6Yu3xWzog/tia9XTpJIjPIElbDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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