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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd81f297cb11391caaa804efe1745a6087a84caac1b6938c8c0f894d1172c7934' 
  AND token = 'v5iEgAuH9FQlE3n6NJU/MzFYvDh8eI3RJ7DaP+Bp+2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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