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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa2ebece5483cae0f416f39ee048e58bba4aba169eed1c4a44b4c600a65a0db0' 
  AND token = 'f8od95/0c9O49++3UzldfQamUtyQJt8jl8rXbGr2O3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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