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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed5aba21d73228536307f434becdc368e5d6b3805d7e075a79e9e15350a95064' 
  AND token = '6Z3CN4n4tPRFjX/n6ukyBgRcC3Pq87bQPtXBtLg1jic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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