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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9f99f64648dfd7d8d0a1d8e24ad7266531b25c704ebd077cfb85ae76f973184' 
  AND token = '+Uj2IPncwKGgsNGulrrQ2eeKLL2AjM33csbkWUpBKF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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