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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '943a96200f7a1ab44f457c58d2a4c3cb4503e931f571e9f0ac3cf8dcbf420c30' 
  AND token = 'wJrxwzEBYzi8II6lkxIrPJ9NrzhDVIkTgtT1rN802+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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