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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96f5a8e3becda29c7805a057559bc8f86181cede85ebda55d3aa5d770b1862e3' 
  AND token = 'e9tJajeY84N1WKfZAkV3j8TYZ33I9tT9h5xkNNR/3F4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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