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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5e89cd023d4b6d94978f271e73b3e849e9acac140a9f3f81e61443298736d47' 
  AND token = 'RXmQb3RBgT6m3F8d/d8Y4OMCdDXMducf2ucqDGGqrNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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