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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da48f18a67ac80af40b49848ecb25b13c464f44d23d34c1f5b19ecca4cb0bf98' 
  AND token = 'EVr/Q4ciP5BQJC9NnlxFcLr2W0g5oMEbUmpQBJHDBVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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