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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '908833fcc4af6fdb8446431e5ec122802076dc7798bd80c270da19ce203ecb26' 
  AND token = 'q6ErZXbGbECOU3RxQ+jxzZnB9pltJLfbAdPaRhIef50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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