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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa30243b1c8673f7159721fa6ef55200784f2940f9fb6ab04cfaa543d5f5c123' 
  AND token = 'nZ/fx8gg1E7W7PdAGQnsIKnUDDfbYgKV7gZ+3Wa+SOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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