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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6aa400fe0fa2db50f3fb857c6896d69068ec452b26d9047ca303632bc40ac7ff' 
  AND token = 'sJ200RMT2t3GyRDiuq6+oxWXEixYJMexqHV50UYfj9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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