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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47607007fa90eafeb8de06bd2edcf10cc014fcbaa57ea988e185c45d8080903a' 
  AND token = '+zL8hE8FkcjIJk5kDlDTcL6wGs/W5KTLFe56+Z5aIVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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