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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bb14901240ae0768c28c9e0bac98aa3e83c8bd7b57c86e573272a903a0c87e1' 
  AND token = 'fI/MkoB0IzFn72oc7ewQlH9hnJOkfU56bCwwSDcZlc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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