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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb7a15bc723088075a0df9b4312b13b9d4eed952c590448bf4df330a8e501731' 
  AND token = 'qhD1mNjJHxQvikAP4G5+7Ng3dvvqtBwZabbS33YcXdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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