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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05f99b6094c9bf17758dc7a3aaed650b8b53ec4fab42e14e84f9e56b86fdd4fd' 
  AND token = 'lEaOLwhntrvrjLQEZ95b0okwFTZGEHeH3zRER2vLCUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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