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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36fa35e6750e932d4a6a61c5b34e4a60028d1de9c1f6cf6a54aaba70dcc98d5f' 
  AND token = '+S4LDRGwvUG7SidHiPsPCv2WtD72dBdEheZpRvaWcYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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