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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b594c2489bd52cd748844c1f7a4f7b0e0c01cdc93288f011159811eee8801df5' 
  AND token = 'qEnwTLlJzMWU7Obmn44TcnKCtx2MZtLXzn7tSeJNlaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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