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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eeba0922d5c006460ccbf2d5ad6365433b965bfd13300331310cdd994453252c' 
  AND token = 'UgQZ96jr0FN73YhpnudCRfYbRS9l77w2G1da9I6l+bY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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