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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cea40e0d03dd7bd79585937163facca612ff0e3a3fc31351be17d5e69c001ee1' 
  AND token = 'R9MV7+h22pqcYX0XgwawH2zP9wjH0lLccMCCfif9O2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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