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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97e004ed05ee28a1f51dc507df9a54a4fcf8573e6e727bfe10e8e1efdc40c90c' 
  AND token = 'zs83U32PnwMfa1pyrnbjCdS5m1Ga3y/sdb48ArvarxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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