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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba858c9beb08aac14cac2be82940a9af48657d38970c80ce82f52715510a9740' 
  AND token = 'uqOFrldaFo+1pqmKCk15Zi3mcXnNU3gLyw88C0Ba+MM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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