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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb5cfa7c4e208d1697e8a5b6ecd50b449cc93916b2dc1a6b9046666db3b47c18' 
  AND token = 'Ale3yCMfY1mMvg6IevXtKFPRzSFx43VFXZwkaE4d8VI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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