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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ad9a67c166a5820f3cce18d4638ad9d143c6eae679330651e98d78c1dd5b07f' 
  AND token = '9HbleT64N9JOliNKzvyuQ8B5VgNbL2mFk+z45N6aIM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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