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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '769e925bbb8f62a1e7dd4501aeea8c8c573f01e67e6268a967d36a7b6e16869e' 
  AND token = '1watJ38aSYmjJ8v33J93gqr4jBZEm+74F9+VMSTE/yE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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