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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f26b74c0522878bf84d157ca1f7b333f616eac89762150195f68f6ceec19ebe' 
  AND token = 'Kv5ppqZ0aYr4f/63PPEl8Wk83JzcrcfbXbHc0drQhpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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