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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60472697fbb7539c5b55f9fa35a708c554f21bf06759e437324d336a6a912b15' 
  AND token = 'i1SGFsMj1PeESUOXvCSZ6sJod2f8E9xc4Rd4vyGNk+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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