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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3dbc896d37b548437330a22b8488790ea2334769db4500c490db3b0d62d6147' 
  AND token = 'Dkl0nafiOV1aSg8xYQkw83xdJLyOl9togAiE1m+KoNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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