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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f1987ca19fd9400c0729243a29315957d0b63d27d1955106807b43e9412ea73' 
  AND token = 'majOiatDowKUa58Y/QxSEk22F3v+ZOb2TKF5mi/lZ8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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