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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9759411bf7baf85d6ea858a5820271f5b3943e0eb0907768966f3ce6ce6f725b' 
  AND token = 'v5riE8+6LyRBbnjkTUX/Rn5rfSe90RGlCVhdjkoPbRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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