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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f2c741e0253d879bdfb92a40816757c96ad22c56ac8c655f944cd583cbcd754' 
  AND token = '7kYujlFuIc+3TRWK4sJ/7o7KpawZ0eTQKk3CSutCYnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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