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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e161a0ff00056a8d4c7b4bcbc86d8c83a13429335be13ac861e73041cd8b68d1' 
  AND token = '95j8yS2ymT5zATb7JkAFLBjf6slXJ4bOVeeJrfmwGJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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