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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d18cc0d1b173614b9ff01410d9f0340df34eb40e4f29501ad263c7dee7d4be6' 
  AND token = '29xiv2qaxLl6bDkcAcMFy5IWcTT9W2Ki5ypm8q7adJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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