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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e9f25a5c8f32d301104d8be0a0af06790e29f4c4d1848ee6482b133f5d5060b' 
  AND token = 'y75pZbDF7wFEEFjcCen93P2i4fpoBPrHOzXzo6Bphwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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