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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '027dcd1293533b46b9e85f6820cd6c2534f682267d88c45a3c6e68ad8f34b687' 
  AND token = 'SDPeNnOCP58b7pGiXRJ4mj6oSdHBkCw45chsHypuXko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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