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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba22c763305a16fb7c895787caaa84ca4b89ebdb4a6c5e61117ca6cf0c883b42' 
  AND token = '9TiD/JAs58OHWfGF2sgXPf5FNN+AeUNZbcwZYWUcSFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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