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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db5708063e7a4a1b0eb563aa5c7708a422db9227b5aae8816a7a98b905283fa2' 
  AND token = 'PdsS62KD8T/sdiXMnNzVCniUEZLJPXIG51JT8xCJTwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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