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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48da8f995fd6ea6f04c8a2f055a15ff1b978e0056f64f3e49c41f1248e50ea6b' 
  AND token = 'lPjCCOB9FXvXTEavxCQfFKIbPeZ4QMFTyKFnM+Cel0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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