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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b861a41f12f1b081e37b1b0c06adf822168c19e31cd0fd223deebb3a7c428f88' 
  AND token = 'GAXvT6Ox2UUwhI53iWpb1qTYSqM8YHMNVL6ux5Y4RoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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