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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bea9e0b1ae0b7a71bcbcc8c7a1dd53c107184ba54b7c34407e257a8529e62006' 
  AND token = 'lhqGP7yiIHuIDBvxt7jwvuq3+717yD9D9wWbLVZ9SrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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