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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '677c925cdf12dedc4294aa85d3513662a19b37be4a4c24e569bdc023b55b9387' 
  AND token = 'HF5Lgg9cIf0XL10t2sOiNKeOwL62McIUP3qapRLv5sw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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