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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80201891341254b17070ac973409eb724c4a2f61b94ad10eacd298b9da924c33' 
  AND token = 'NGvKWOfH+zL1aBgcMnZxfO1K0ACVfD0pLWom+31F4TA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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