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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8c97fbbf533a44eb0b58ca79effbdfe60db122375bed7fb44eeb1d3ece13359' 
  AND token = 'B/5UPd1YF4zVn1pP4j7ydTfEHf4naLJ1L5yXQRInTHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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