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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e14c67962369dba6bc0fe5c22a35277895566be9019ed35323251e01cab21096' 
  AND token = 'ltDCVgz/N9xsnhmGqvh3qF0Hpoq+TNt5d73YzuO28fU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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