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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '711c13c6f30588127245d7f9b170bb0d06933b02a69cd0b327e62d886e194716' 
  AND token = 'siVYPOSNWC24lgRslprJ4oc7lDh5eTJURt8ZOUHzRIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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