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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd0d085c992d5e1b0261b07c7af8fba517af2451d15edf7231ee91ab34a550a1' 
  AND token = 'wT4jlJ/NOaSgHm0yJWPXyuqu6/2NuA2+XCrzv7r/c7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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