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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3e5c0f7653ce98ecb0ee958debfbcd8fc73effc89756511c0253613914bfa67' 
  AND token = '6pLnEJJEmglwuVywPJqruUeir3RQXI4bWA8Zyuumwz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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