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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '820d6129cfc83ad2d821c21f64781c03683e96ff3a2bbc106a1f45739d348ccc' 
  AND token = 'FLFhMcaQQkbraIzFWTPvMQSfcN04k7CPpFLw442qi/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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