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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abf1e92c0e1ecb7a37a4d8094a79ab19635c2853ec193eb0783eb5bc0cd48fc8' 
  AND token = '7GbKZLamhw/c5UAIqAoWVz96LsUpDMBvJas30VMbT4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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