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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fc02f3b94d1a2153d15b51646406632b8d05be87a34244853619d6f9bffba8c' 
  AND token = 'OHMlsB2nxKd8ImPbogYxTD154egxCGJ3iIEltdKSNwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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