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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7611d522f11753ea1fe3a5eedfb42ac2f2458484552d8a89abc9c705022696d5' 
  AND token = 'x7yx4uwBjyH7ckmc7s8b3xSajpLc8Wd7m8eRhT/8s1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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