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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'decd6729d82dec6617469edd6bc4c0231b7dfaa3223783a18b8268d0359348d8' 
  AND token = '3O9LRDKeF05oohcDzzyQRH999eVWCmycpw8AvWVei6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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