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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a835ebf1d8b07377651a535a32f958c08cfa2cbf579a3a934414199dafe3624' 
  AND token = 'dE3Yjsh2Jvc8xAfwZVf4HOTiuPasfihtFSm7OKuabb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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