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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6161f3d586d54ba38c94da6941fbc3ddaa33cb7677a2193dd79937b84c58f954' 
  AND token = '8WW9VNiNWiI+xDhDtErDlAVMS7N7LHEFtsLmNNqFfjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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