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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a918f08543c6dc95edd3fab7b03cfe9d71edd0e4c6e2b3043be41bcdc4c624af' 
  AND token = 'vNB+gDQ1Pbfvy2LEXkE7PmVNVbdutaadueog06JfFd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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